This study is to establish a pilot pharmacogenomic program in identifying genetic variation to predict the safety, toxicity and/or efficacy of drugs. DNA will be extracted from patients' peripheral blood to study SNPs in DPD, TS, MTHFR, UGT1A1, CYP3A4, CYP3A5, GSTM1, GSTT1, GSTP1, HO-1, ERCC1, XPD, XRCC1 and EGFR genes. The results of genetic study will be compared to treatment efficacy and toxicity. The ultimate goal is to use genotype profiles to provide individualized cancer treatment to improve outcome and decrease toxicity.